“That’s the only way we can ensure that (big banks’) riskier businesses don’t undermine the insured deposits that are the foundation of a stable and healthy economy,” Frost wrote in a piece with the headline: “Tom Frost: The Big Danger with Big Banks.”

Last week, Frost made similar comments in testimony before the Senate Banking Committee’s Subcommittee on Financial Institutions and Consumer Protection. The subcommittee is seeking recommendation on federal policy aimed at preventing another “too big to fail” scenario. In 2008, banks were slammed by investments in mortgage-backed securities that lost value when the housing market tanked. A link to his remarks to the subcommittee can be found here.

Dick Evans, chairman and CEO of Cullen/Frost Bankers Inc., the bank’s holding company, last month told my colleague David Hendricks that bank depositors shouldn’t be exposed to the risky activities of big banks.